Abstract
Chlorine doped Y123 thin films have been successfully prepared by the fluorine-free metal organic decomposition (FF-MOD) method on SrTiO3(100) single crystal substrates. The rectangular Ba2Cu3O4Cl2 (Ba2342) columns were epitaxially grown in the film without degrading crystallinity and transition temperature (Tc) of Y123. Cl-doped Y123 films maintained high Tc of 90.5–91.5 K and they showed higher critical current density (Jc) than the Cl-free films particularly in magnetic fields. The high Jc feature was observed in thick films up to ∼0.93 μm in thickness. In addition, Cl and Hf co-doped Y123 films maintained high crystallinity and showed further improved Jc of 1.1 MA cm−2 at 40 K under 5 T. These suggested that Ba2342 precipitates have two effects on FF-MOD processed Y123 films. One is an increase in pinning force and the other is improvement of crystallinity of Y123 because of the good lattice matching between Y123 and Ba2342.
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